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Brice T

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Posts posted by Brice T

  2. Posted

    18 hours ago, the_crayon_king said:

    The Arcadia 2001 board works and all the parts are in etc. The board can be made to work on the derivatives of the Arcadia but I need to purchase each variation and test them manually. I am sure I can make it work but I would rather not do exploratory modding on someone else's console.
     

    There is an extra line on the PPU that could be used to expand color outputs. The Arcadia doesn't use this but I do not know about the others. I also don't know if the PPU of the derivative consoles uses the same exact PPU and also need pullup resistors.

     

     

    I really do not want to work on a console like this that I do not personally own. Consoles like the Fairchild, Arcadia, and Astrocade kind of seem like the break when looking at them funny and I do not want to be liable for damages in the event something goes wrong. They are expensive and I typically cover anything I do. However, I can't cover a 150$+ console that likes to burn up sporadically.

     

    To be clear I doubt completely that the RGB mod kit can do any damage when properly installed but the impression would be that I or the board broke something when it is just that the darn thing fried of its own accord. Those inductors in the Arcadia are a prime example of what I am talking about.

    I currently don't have either but I want to get one to add to my rgb setup, how much would the mod cost if I sent it to you? And would the japan bandi version work?

  3. Posted

    On 12/27/2020 at 9:04 PM, the_crayon_king said:

    I am not sure about Emerson's design.

    Mine has been done for some time I had just been waiting for parts to arrive.

    Anyway, those parts are finally here and I will start putting these together very soon.

    When it comes can you message me and let me know? And I can send it to you and you can mod if for me?Also do you know of anyone modding apf mp1000/m1000?

     

  4. Posted

    On 5/19/2019 at 8:59 AM, emerson said:

    I got this working a few weeks ago. My design uses the same circuit as my intellivision rgb mod, just had to rewrite the truth table in the GAL22V10. I have some blank circuit boards sitting on my desk waiting to be assembled. I'll post some pics when I get them built.

     

    Edit: Your truth table matches mine except I didn't consider "1xxx" for white. Blanking is logic "1"

     

    About that line that's ORed across RGB, the chip is a 74ls86 which is XOR. In my console the hardware doesn't match the schematic in the service manual. C0 from the 2637 isn't connected to the RGB XOR gates. Instead, the flag signal from the 2650A is buffered through one of the XOR gates then connected to the RGB gates. Again, this is just my console which had been opened previously.

     

    Also, the color code signals from the 2637 appear to be open collector as I measured only 1vpp signals at the inputs of the 74ls86. Somehow it's operating outside of the ttl standards. On top of that, the 74ls86 is driving a 4069 and you're not supposed to drive CMOS logic with TTL. I placed 1k pullups on the color code signals and intend to replace the 74ls86 with 74hct86 when I install the mod. Hope this helps.

    Is it available yet?

     

  13. Posted

    13 hours ago, Jinks said:

    You can not convert pins and it magically will work.

    If I put an Audi sticker on my VW it turns into a Audi? 

    How old are you? 7? Btw this has nothing to do with the topic. 

    I have no clue how that works I know nothing about how hardware works and I don't know what topic to go to i joined this website a week or so ago

     

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